塔西南拗陷甫沙构造带结构模型及形成机制

塔西南拗陷甫沙构造带是西昆仑山前第一排冲断褶皱带。由于浅层覆盖第四系巨厚黄土及深层强烈冲断褶皱变形导致地震资料品质较低,构造解释具有多解性。通过综合分析区域构造背景、地面地质、钻井和地震资料,认为浅层是以上白垩统—古近系膏盐岩为滑脱层的盖层滑脱褶皱变形;深层是基底卷入的中—高角度区域性正反转断层,及在正反转断层下盘由叠瓦状分支逆冲断层组成的楔状叠瓦构造,深、浅构造层整体"分层收缩、垂向叠置"模型能合理解释现有的可靠构造信息。正反转断层在横向上分隔甫沙构造带与西昆仑褶皱造山带,膏盐岩塑性滑脱层在纵向上分隔浅层新生代与深层中生代构造变形。西昆仑山在新近纪—第四纪隆升,引发了自西昆仑山深层向塔西南拗陷斜向向上挤压,促使侏罗—白垩纪区域性先存正断层反转,并控制甫沙构造带的形成演化。     

大洼──昌图凹陷的构造演化与油气分布

大洼─昌图凹陷是铁岭─昌图盆地内的一个次级负向构造单元，是在海西褶皱带基底上发育起来的一个晚侏罗世至早白垩世的早断晚拗型凹陷．依其构造及沉积特征，并结合我国东部中生代的构造特点将其演化划分为四个阶段：即凹陷的孕育期、断陷期、拗陷期及萎缩消亡期．并运用板块理论对其演化的动力学机制进行探讨．最后通过构造对生储盖的控制作用，指出有利的勘探部位．     

周口拗陷油气地质特征

目的 周口拗陷是由多个次级凹陷、多套烃源岩层、多套目的层系组成的一个复式拗陷，认识其地质特征对油气勘探意义重大。方法 运用地震资料解释、地震地质综合研究、层序地层、圈闭评价等方法，对生、储、盖、圈、运、保等基本石油地质条件进行了分析。结果 认为该区油气资源丰富，有4个主要圈闭形成期和油气运移期，形成3种油气聚集类型；综合评价指出谭庄-沈丘凹陷、倪丘集凹陷为Ⅰ类勘探有利区，舞阳、襄城、鹿邑凹陷为Ⅱ类勘探有利区。结论 周口凹陷的油气勘探，应围绕该有利地区进行深入研究。     

黔南拗陷构造变形特征与油气保存有利区评价

根据沉积层序、构造变形样式及地层接触关系,将黔南拗陷沉积盖层划分为3大构造层,并重新划分黔南拗陷的构造区划。通过野外地质调查并结合地球物理资料,按黔南拗陷断裂特征及其不同部位构造变形强度的差异,将黔南拗陷划分为叠瓦冲断变形区和褶皱冲断变形区。黔南拗陷具有东西分带、上下分层的特点。依据各构造单元变形强度等相关要素的评价,优选出长顺凹陷为相对稳定的油气保存区,结合该区的石油地质条件,指出长顺凹陷为下步油气勘探的有利区带。     

四川盆地纵向结构及原型盆地叠合特征

位于扬子克拉通西部的四川盆地在前震旦纪基底形成之后经历了多旋回构造演化,长期以来对其在不同地质历史时期的构造动力学性质、盆地类型存在争议;而理清不同时期盆地类型及其叠合特征对于上扬子克拉通盖层演化及油气勘探具有重要意义。作者利用穿过盆地的北西-南东向区域地震反射大剖面,结合钻井、野外地质、区域地质资料,对四川盆地的构造-沉积演化进行剖析,识别出5个区域不整合面,划分出5个盖层构造层,认为在纵向上形成了海相克拉通裂陷盆地(Z-S)、海相克拉通拗陷盆地(P_1l-T_2l)、海陆交互相断陷盆地(T_3x^1-T_3x^3)、陆相拗陷盆地(T_3x^4-J)、前陆盆地(K-Q)等原型盆地的有序叠合。     

南襄盆地唐河低凸起地质结构与勘探潜力

唐河低凸起是南襄盆地内分隔泌阳凹陷与南阳凹陷的次级正向构造单元，其地质结构研究对该区油气勘探和分析泌阳、南阳两富油凹陷的构造—沉积充填关系均具有重要意义。以地震、钻测井及地化资料为基础，分析唐河低凸起的地层充填、构造特征、形成演化和成因机制，并探讨其油气勘探潜力。研究表明，唐河低凸起自下而上发育玉皇顶组、大仓房组、核桃园组、凤凰镇组及平原组。构造东西分块，为受桐河街断层分隔的南阳、泌阳两凹陷斜坡带组成的“类地垒”形态；南北分带，呈多个半地堑形态。构造演化分析将该区演化阶段划分为统一沉降期、差异沉降期、挤压定型期和拗陷期4个阶段，低凸起的成因机制与区域构造应力场转换下边界断层的差异活动密切相关。唐河低凸起具有多凹陷烃源岩供烃、多层系有效储层发育、长期高效输导体系及多类型圈闭垂向叠加的有利条件，具有一定的油气勘探潜力。     

海拉尔盆地贝尔凹陷构造演化及其对油气控制

系统分析了贝尔凹陷断裂构造特征,研究了断裂的形成演化对油气成藏条件的控制作用。贝尔凹陷自下而上划分为断陷构造层、断-坳转化构造层和凹陷构造层。根据断裂与构造层关系及断裂运动学特征,将贝尔凹陷发育的断层划分为上部断层系、下部断层系和长期发育的断层系断裂3种类型。各个历史演化时期控制着不同成因的断裂发育,贝尔凹陷早期铜钵庙组～大磨拐河组时期的伸展变形控制断陷盆地的发生、发展、消亡的演化过程,伊敏组时期的走滑变形主要形成一系列断裂密集带,同时形成大量次级盖层断层,青元岗组时期的反转构造变形形成了断层型构造反转和局部的背斜型构造反转。断裂的形成和演化影响主力烃源岩的分布和热演化程度,形成多种类型的圈闭,为油气运移提供良好的运移通道。发育长期活动断层的斜坡带和由长期继承性活动断裂与上部断层系构成的密集带是油气运聚成藏的有利指向区,控制着贝尔凹陷油气富集。     

鄂尔多斯盆地西缘中部的横向构造带探讨

目的 探讨鄂尔多斯盆地西缘的东西向构造带的属性,为找矿提供理论依据.方法 从横向构造带的概念和特征入手,通过西缘中部在地质、地球物理和遥感等资料与相邻地区的差异分析为主要方法.结果 鄂尔多斯盆地西缘中部确实存在一个东西向的横向构造带,且具有形成时间早,多期活动的特点.晚侏罗世是主要的活动时期,造成了西缘南北部构造的明显差异.其形成演化是不同时期不同性质的动力学环境相互作用的结果.结论 鄂尔多斯盆地中部的横向构造带具有显著的分区特征,为油气、煤和铀矿共存成藏(矿)的有利地区.     

黄骅拗陷新生代构造样式及其演化

为了揭示黄骅拗陷新生代盆地原型、恢复盆地构造演化历史,运用油区构造解析理论,对黄骅拗陷新生代盆地构造样式及其演化进行综合分析,认为盆区存在伸展式和走滑式两种基本构造样式。在盆地尺度内,按断层几何学和运动学特点,伸展构造样式可进一步分为伸展拗陷、伸展拗断、地堑断陷、多米诺半地堑断陷、滚动半地堑断陷、复式半地堑断陷、跷跷板断陷、伸展断拗8种次级构造样式,并基本遵循伸展拗陷—伸展拗断—伸展断陷—伸展断拗演化序列,这种演化序列与岩石圈的流变学特征和递进伸展变形过程有关。走滑构造样式受深断裂走滑作用控制,可分为雁列式走滑构造和帚状断层组。     

西藏高原东部江达构造带陆内裂谷演化与成矿作用

运用地体-板块构造理论分析了江达构造带陆内裂谷期的演化过程.研究表明,作为昌都-思茅构造带的一个主要组成部分,江达构造带陆内裂谷发生于陆缘岩浆弧基础之上,发育典型的裂谷地貌、沉积建造和双峰式岩浆活动,其演化经历了火山地堑阶段(T3-J1)、陆内拗陷阶段(J2-K2)和走滑堑-垒构造系阶段(E1-E2).成矿作用主要发生在火山地堑阶段和陆内拗陷阶段,火山地堑阶段以喷流沉积型矿床为主,陆内拗陷阶段形成夕卡岩型多金属矿床.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to